title: Preparation of biological fluids for simultaneous analysis of prostaglandin cyclo-oxygenase synthesized compounds by gas chromatography with electron capture detection.
abstract: A method for isolating climax products of the arachidonic acid cascade from biological fluids is described which allows simultaneous measurement of PGs (PGE2, PGD2, 6-keto-PGF1 alpha, TXB2, 6-keto-PGE1, 6, 15-diketo-13,14-dihydro-PGF1 alpha) by electron capture detection of pentafluorobenzyloxime methyl ester trimethylsilyl (TMS) ether derivatives. PGs are adsorbed onto Amberlite XAD-2 from acidified solution and nonadhering substances removed by sequential administration of water, then petroleum ether. PGs are extracted into methanol. Following evaporation and reconstitution in water, the PGs are extracted into ethyl acetate at pH 3 and the ethyl acetate extracts are purified by lipidex column chromatography. Derivatization to pentafluorobenzyloxime methyl ester TMS ethers of PGs in the sample is followed by separation on either glass packed-columns or SCOT capillary columns, and detection by an electron capture detector. PGA2, added to the unpurified sample, is used as an internal standard for quantification. The methods have performed well on all biological fluids thus far examined. Examples of chromatographs from urine, Krebs-perfused lung effluents, and blood are shown.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D004285:Dogs; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D008168:Lung / Q000032:analysis; D010091:Oximes; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism; D011453:Prostaglandins / Q000097:blood / Q000302:isolation & purification* / Q000652:urine; D012756:Sheep; D014297:Trimethylsilyl Compounds
chemical_list: D010091:Oximes; D011453:Prostaglandins; D014297:Trimethylsilyl Compounds; D011451:Prostaglandin-Endoperoxide Synthases